third_party/openssl: add ChaCha20+Poly1305 support.

openssl/crypto/evp/evp_aead.c

-/* crypto/x509/x509_set.c */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
  * This package is an SSL implementation written
  * by Eric Young (eay@cryptsoft.com).
  * The implementation was written so as to conform with Netscapes SSL.
  * 
  * This library is free for commercial and non-commercial use as long as
  * the following conditions are aheared to.  The following conditions
  * apply to all code found in this distribution, be it the RC4, RSA,
@@ skipping 37 matching lines @@
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  * 
  * The licence and distribution terms for any publically available version or
  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  * copied and put under another distribution licence
  * [including the GNU Public Licence.]
  */
 
-#include <stdio.h>
-#include "cryptlib.h"
-#include <openssl/asn1.h>
-#include <openssl/objects.h>
+#include <limits.h>
+#include <string.h>
+
 #include <openssl/evp.h>
-#include <openssl/x509.h>
+#include <openssl/err.h>
 
-int X509_set_version(X509 *x, long version)
+#include "evp_locl.h"
+
+size_t EVP_AEAD_key_length(const EVP_AEAD *aead)
         {
-        if (x == NULL) return(0);
-        if (x->cert_info->version == NULL)
-                {
-                if ((x->cert_info->version=M_ASN1_INTEGER_new()) == NULL)
-                        return(0);
-                }
-        return(ASN1_INTEGER_set(x->cert_info->version,version));
+        return aead->key_len;
         }
 
-int X509_set_serialNumber(X509 *x, ASN1_INTEGER *serial)
+size_t EVP_AEAD_nonce_length(const EVP_AEAD *aead)
         {
-        ASN1_INTEGER *in;
-
-        if (x == NULL) return(0);
-        in=x->cert_info->serialNumber;
-        if (in != serial)
-                {
-                in=M_ASN1_INTEGER_dup(serial);
-                if (in != NULL)
-                        {
-                        M_ASN1_INTEGER_free(x->cert_info->serialNumber);
-                        x->cert_info->serialNumber=in;
-                        }
-                }
-        return(in != NULL);
+        return aead->nonce_len;
         }
 
-int X509_set_issuer_name(X509 *x, X509_NAME *name)
+size_t EVP_AEAD_max_overhead(const EVP_AEAD *aead)
         {
-        if ((x == NULL) || (x->cert_info == NULL)) return(0);
-        return(X509_NAME_set(&x->cert_info->issuer,name));
+        return aead->overhead;
         }
 
-int X509_set_subject_name(X509 *x, X509_NAME *name)
+size_t EVP_AEAD_max_tag_len(const EVP_AEAD *aead)
         {
-        if ((x == NULL) || (x->cert_info == NULL)) return(0);
-        return(X509_NAME_set(&x->cert_info->subject,name));
+        return aead->max_tag_len;
         }
 
-int X509_set_notBefore(X509 *x, const ASN1_TIME *tm)
+int EVP_AEAD_CTX_init(EVP_AEAD_CTX *ctx, const EVP_AEAD *aead,
+                      const unsigned char *key, size_t key_len,
+                      size_t tag_len, ENGINE *impl)
         {
-        ASN1_TIME *in;
-
-        if ((x == NULL) || (x->cert_info->validity == NULL)) return(0);
-        in=x->cert_info->validity->notBefore;
-        if (in != tm)
+        ctx->aead = aead;
+        if (key_len != aead->key_len)
                 {
-                in=M_ASN1_TIME_dup(tm);
-                if (in != NULL)
-                        {
-                        M_ASN1_TIME_free(x->cert_info->validity->notBefore);
-                        x->cert_info->validity->notBefore=in;
-                        }
+                EVPerr(EVP_F_EVP_AEAD_CTX_INIT,EVP_R_UNSUPPORTED_KEY_SIZE);
+                return 0;
                 }
-        return(in != NULL);
+        return aead->init(ctx, key, key_len, tag_len);
         }
 
-int X509_set_notAfter(X509 *x, const ASN1_TIME *tm)
+void EVP_AEAD_CTX_cleanup(EVP_AEAD_CTX *ctx)
         {
-        ASN1_TIME *in;
-
-        if ((x == NULL) || (x->cert_info->validity == NULL)) return(0);
-        in=x->cert_info->validity->notAfter;
-        if (in != tm)
-                {
-                in=M_ASN1_TIME_dup(tm);
-                if (in != NULL)
-                        {
-                        M_ASN1_TIME_free(x->cert_info->validity->notAfter);
-                        x->cert_info->validity->notAfter=in;
-                        }
-                }
-        return(in != NULL);
+        if (ctx->aead == NULL)
+                return;
+        ctx->aead->cleanup(ctx);
+        ctx->aead = NULL;
         }
 
-int X509_set_pubkey(X509 *x, EVP_PKEY *pkey)
+/* check_alias returns 0 if |out| points within the buffer determined by |in|
+ * and |in_len| and 1 otherwise.
+ *
+ * When processing, there's only an issue if |out| points within in[:in_len]
+ * and isn't equal to |in|. If that's the case then writing the output will
+ * stomp input that hasn't been read yet.
+ *
+ * This function checks for that case. */
+static int check_alias(const unsigned char *in, size_t in_len,
+                       const unsigned char *out)
         {
-        if ((x == NULL) || (x->cert_info == NULL)) return(0);
-        return(X509_PUBKEY_set(&(x->cert_info->key),pkey));
+        if (out <= in)
+                return 1;
+        if (in + in_len <= out)
+                return 1;
+        return 0;
         }
 
+ssize_t EVP_AEAD_CTX_seal(const EVP_AEAD_CTX *ctx,
+                          unsigned char *out, size_t max_out_len,
+                          const unsigned char *nonce, size_t nonce_len,
+                          const unsigned char *in, size_t in_len,
+                          const unsigned char *ad, size_t ad_len)
+        {
+        size_t possible_out_len = in_len + ctx->aead->overhead;
+        ssize_t r;
 
+        if (possible_out_len < in_len /* overflow */ ||
+            possible_out_len > SSIZE_MAX /* return value cannot be
+                                            represented */)
+                {
+                EVPerr(EVP_F_AEAD_CTX_SEAL, EVP_R_TOO_LARGE);
+                goto error;
+                }
 
+        if (!check_alias(in, in_len, out))
+                {
+                EVPerr(EVP_F_AEAD_CTX_SEAL, EVP_R_OUTPUT_ALIASES_INPUT);
+                goto error;
+                }
+
+        r = ctx->aead->seal(ctx, out, max_out_len, nonce, nonce_len,
+                            in, in_len, ad, ad_len);
+        if (r >= 0)
+                return r;
+
+error:
+        /* In the event of an error, clear the output buffer so that a caller
+         * that doesn't check the return value doesn't send raw data. */
+        memset(out, 0, max_out_len);
+        return -1;
+        }
+
+ssize_t EVP_AEAD_CTX_open(const EVP_AEAD_CTX *ctx,
+                         unsigned char *out, size_t max_out_len,
+                         const unsigned char *nonce, size_t nonce_len,
+                         const unsigned char *in, size_t in_len,
+                         const unsigned char *ad, size_t ad_len)
+        {
+        ssize_t r;
+
+        if (in_len > SSIZE_MAX)
+                {
+                EVPerr(EVP_F_AEAD_CTX_OPEN, EVP_R_TOO_LARGE);
+                goto error;  /* may not be able to represent return value. */
+                }
+
+        if (!check_alias(in, in_len, out))
+                {
+                EVPerr(EVP_F_AEAD_CTX_OPEN, EVP_R_OUTPUT_ALIASES_INPUT);
+                goto error;
+                }
+
+        r = ctx->aead->open(ctx, out, max_out_len, nonce, nonce_len,
+                            in, in_len, ad, ad_len);
+
+        if (r >= 0)
+                return r;
+
+error:
+        /* In the event of an error, clear the output buffer so that a caller
+         * that doesn't check the return value doesn't try and process bad
+         * data. */
+        memset(out, 0, max_out_len);
+        return -1;
+        }